[luxembourg] Migrate nfs to srv-data2

data/grid5000/sites/luxembourg/servers/srv-data.json

 {
   "alias": [
-    "nfs",
-    "home-g5k",
-    "public",
-    "storage1",
-    "modules"
+    "storage1"
   ],
   "group_storage": {
     "name": "storage1",

data/grid5000/sites/luxembourg/servers/srv-data2.json

 {
   "alias": [
     "srv-data-belval",
-    "storage2"
+    "storage2",
+    "nfs",
+    "home-g5k",
+    "public",
+    "modules"
   ],
   "group_storage": {
     "name": "storage2",

input/grid5000/sites/luxembourg/servers/physical.yaml

 ---
 srv-data:
   kind: physical
-  alias: [nfs, home-g5k, public, storage1, modules]
+  alias: [storage1]
   warranty: 2024-02
   serial: 4HDKFV2
   network_adapters:
@@ -17,7 +17,7 @@ srv-data:
 
 srv-data2:
   kind: physical
-  alias: [srv-data-belval, storage2]
+  alias: [srv-data-belval, storage2, nfs, home-g5k, public, modules]
   warranty: 2029-07
   serial: CSQXL44
   network_adapters: